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8 papers · 1 filter
Instabilities and the roton spectrum of a quasi-1D Bose-Einstein condensed gas with dipole-dipole interactions
Stefano Giovanazzi, Duncan H J O'Dell
We point out the possibility of having a roton-type excitation spectrum in a quasi-1D Bose-Einstein condensate with dipole-dipole interactions. Normally such a system is quite unst…
A simple proof of a theorem of Karrass and Solitar
Delaram Kahrobaei
In this note we give a particularly short and simple proof of the following theorem of Karrass and Solitar. Let be a finitely generated subgroup of a free group with infini…
The Amalgamated product of free groups and residual solvability
Delaram Kahrobaei
In this paper we study residual solvability of the amalgamated product of two finitely generated free groups, in the case of doubles. We find conditions where this kind of structur…
Three-Dimensional Spin Fluctuations in Na0.75CoO2
L. M. Helme, A. T. Boothroyd, R. Coldea +4
We report polarized- and unpolarized-neutron scattering measurements of magnetic excitations in single-crystal Na0.75CoO2. The data confirm ferromagnetic correlations within the co…
The mechanism of Swing Absorption of fast magnetosonic waves in inhomogeneous media
B. M. Shergelashvili, T. V. Zaqarashvili, S. Poedts +1
The recently suggested swing interaction between fast magnetosonic and Alfvén waves (2002) is generalized to inhomogeneous media. We show that the fast magnetosonic waves propagati…
Fragment Driven Magnetic Reconnection
K. Galsgaard, C. Parnell
In this paper, we investigate a simple model where two, initially unconnected, flux systems are forced to interact in response to the imposed boundary driving by solving the non-id…